[RPG] What level do I cast invisibility from the eldritch invocation Shroud of Shadow?

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The eldritch invocation Shroud of Shadow from the UA: Revised Class Options reads as follows:

You can cast invisibility at will, without expending a spell slot.

Similar abilities such as a wizard's spell mastery specify that the caster can only cast the at-will spells at their lowest spell level:

You can cast those [at will] spells at their lowest level without expending a spell slot when you have them prepared.

Shroud of Shadow has no such clause. So can this invisibility spell be cast at a higher level?

Best Answer

Spells cast without a spell slot are cast at their lowest level. And no, you can't cast it at a higher level because to do so would require you to expend a higher level spell slot.

From page 12 of the Sage Advice Compendium:

What level is a spell if you cast it without a spell slot?
Such a spell is cast at its lowest possible level, which is the level that appears near the top of its description. Unless you have a special ability that says otherwise, the only way to increase the level of a spell is to expend a higher-level spell slot when you cast it